Add Configure on FFMpegArgumentProcessor to fuently configure ffoptions per run.

FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs

@@ -14,6 +14,7 @@ namespace FFMpegCore
     public class FFMpegArgumentProcessor
     {
         private static readonly Regex ProgressRegex = new Regex(@"time=(\d\d:\d\d:\d\d.\d\d?)", RegexOptions.Compiled);
+        private readonly List<Action<FFOptions>> _configurations;
         private readonly FFMpegArguments _ffMpegArguments;
         private Action<double>? _onPercentageProgress;
         private Action<TimeSpan>? _onTimeProgress;
@@ -22,6 +23,7 @@ public class FFMpegArgumentProcessor
 
         internal FFMpegArgumentProcessor(FFMpegArguments ffMpegArguments)
         {
+            _configurations = new List<Action<FFOptions>>();
             _ffMpegArguments = ffMpegArguments;
         }
 
@@ -70,10 +72,15 @@ public FFMpegArgumentProcessor CancellableThrough(CancellationToken token, int t
             token.Register(() => CancelEvent?.Invoke(this, timeout));
             return this;
         }
+        public FFMpegArgumentProcessor Configure(Action<FFOptions> configureOptions)
+        {
+            _configurations.Add(configureOptions);
+            return this;
+        }
         public bool ProcessSynchronously(bool throwOnError = true, FFOptions? ffMpegOptions = null)
         {
-            using var instance = PrepareInstance(ffMpegOptions ?? GlobalFFOptions.Current, out var cancellationTokenSource);
+            var options = GetConfiguredOptions(ffMpegOptions);
-            var errorCode = -1;
+            using var instance = PrepareInstance(options, out var cancellationTokenSource);
 
             void OnCancelEvent(object sender, int timeout)
             {
@@ -88,6 +95,7 @@ void OnCancelEvent(object sender, int timeout)
             CancelEvent += OnCancelEvent;
             instance.Exited += delegate { cancellationTokenSource.Cancel(); };
 
+            var errorCode = -1;
             try
             {
                 errorCode = Process(instance, cancellationTokenSource).ConfigureAwait(false).GetAwaiter().GetResult();
@@ -106,8 +114,8 @@ void OnCancelEvent(object sender, int timeout)
 
         public async Task<bool> ProcessAsynchronously(bool throwOnError = true, FFOptions? ffMpegOptions = null)
         {
-            using var instance = PrepareInstance(ffMpegOptions ?? GlobalFFOptions.Current, out var cancellationTokenSource);
+            var options = GetConfiguredOptions(ffMpegOptions);
-            var errorCode = -1;
+            using var instance = PrepareInstance(options, out var cancellationTokenSource);
 
             void OnCancelEvent(object sender, int timeout)
             {
@@ -121,6 +129,7 @@ void OnCancelEvent(object sender, int timeout)
             }
             CancelEvent += OnCancelEvent;
 
+            var errorCode = -1;
             try
             {
                 errorCode = await Process(instance, cancellationTokenSource).ConfigureAwait(false);
@@ -163,6 +172,18 @@ private bool HandleCompletion(bool throwOnError, int exitCode, IReadOnlyList<str
             return exitCode == 0;
         }
 
+        private FFOptions GetConfiguredOptions(FFOptions? ffOptions)
+        {
+            var options = ffOptions ?? GlobalFFOptions.Current.Clone();
+
+            foreach (var configureOptions in _configurations)
+            {
+                configureOptions(options);
+            }
+
+            return options;
+        }
+
         private Instance PrepareInstance(FFOptions ffOptions,
             out CancellationTokenSource cancellationTokenSource)
         {

FFMpegCore/FFOptions.cs

@@ -1,10 +1,11 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 
 namespace FFMpegCore
 {
-    public class FFOptions
+    public class FFOptions : ICloneable
     {
         /// <summary>
         /// Working directory for the ffmpeg/ffprobe instance
@@ -38,5 +39,13 @@ public class FFOptions
         /// Whether to cache calls to get ffmpeg codec, pixel- and container-formats
         /// </summary>
         public bool UseCache { get; set; } = true;
+
+        /// <inheritdoc/>
+        object ICloneable.Clone() => Clone();
+
+        /// <summary>
+        /// Creates a new object that is a copy of the current instance.
+        /// </summary>
+        public FFOptions Clone() => (FFOptions)MemberwiseClone();
     }
 }